Cold-Junction Compensated, 1-Wire Thermocouple-to-Digital Converters

Accurate 1-Wire thermocouple-to-digital converter ICs ease design effort and lower system cost

Image of Maxim Integrated's Cold-Junction Compensated, 1-Wire Thermocouple-to-Digital ConvertersMaxim's MAX31850/MAX31851 cold-junction compensated, 1-Wire® thermocouple-to-digital converters perform cold-junction compensation and digitize the signal from a K-, J-, N-, T-, S-, R-, or E-type thermocouple. The converters resolve temperatures to 0.25°C, allow readings as high as +1768°C and as low as -270°C, and exhibit thermocouple accuracy of 8 LSBs (2°C) for temperatures ranging from -200°C to +700°C.

Communication with the master microcontroller is over a 1-Wire bus that by definition requires only one data line (and ground) for communication. Operating power can be obtained directly from the data line ("parasite power"), eliminating the need for an external power supply.

Each device has a unique 64-bit serial code, which allows multiple units to function on the same 1-Wire bus. Therefore, it is simple to use one microcontroller (the master device) to monitor temperature from many thermocouples distributed over a large area.

Four location address inputs simplify mapping of individual units to specific locations.

Features
  • Cold-junction compensation
  • Versions available for multiple thermocouples types: MAX31850 supports K-, J-, N-, T-, and E-types; MAX31851 supports S- and R-types (see table 1 in the full data sheet)
  • Detects thermocouple shorts to GND or VDD
  • 14-bit, 0.25°C resolution
  • 1-wire interface (read-only); power can be obtained from interface (parasite-powered mode)
  • Detects open thermocouple

MAX31850/MAX31851

ImageManufacturer Part NumberDescriptionAvailable Quantity
IC CONV THRMCPLE-DIG E TYPE TDFNMAX31850EATB+IC CONV THRMCPLE-DIG E TYPE TDFN54 - ImmediateView Details
IC CONV THRMCPLE-DIG J TYPE TDFNMAX31850JATB+IC CONV THRMCPLE-DIG J TYPE TDFN150 - Factory StockView Details
IC CONV THRMCPLE-DIG K TYPE TDFNMAX31850KATB+IC CONV THRMCPLE-DIG K TYPE TDFN0View Details
IC CONV THRMCPLE-DIG N TYPE TDFNMAX31850NATB+IC CONV THRMCPLE-DIG N TYPE TDFN110 - ImmediateView Details
IC CONV THRMCPLE-DIG T TYPE TDFNMAX31850TATB+IC CONV THRMCPLE-DIG T TYPE TDFN486 - ImmediateView Details
IC THRMOCPLE TO DIG CONV 10TDFNMAX31851RATB+IC THRMOCPLE TO DIG CONV 10TDFN86 - ImmediateView Details
EVAL KIT FOR MAX31850MAX31850EVKIT#EVAL KIT FOR MAX318501 - Immediate
7 - Factory Stock
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Published: 2013-12-13